Witnesses told police they saw a man climb over the retaining wall above the Horseshoe Falls and deliberately jump into the water.

They say the man went over the Horseshoe Falls and surfaced in the lower Niagara River basin adjacent to the Journey Behind the Falls observation platform.

The man was found by a Niagara Parks Police officer along the rocky shoreline as he collapsed in water that was up to his waist.

"When I first looked at him, it was quite apparent that he was in a state not only of shock, hypothermia had probably started to set in," said Sgt. Chris Gallagher of the Niagara Falls Parks Police.

Rescue crews were able to get the man out. He was transported to Hamilton General Hospital with life-threatening injuries. Monday night police said he was in serious, but stable, condition. He is expected to make a full recovery.

This is the fourth time someone has survived a plunge over the falls unprotected.

The rescue effort took place at Table Rock on the Canadian side of the Falls. That location is where Nik Wallenda is expected to end his high-wire walk over the falls on June 15th.